Motorcycles used in motocross racing are modified to improve off-road performance and handling. The motorcycle pictured here has a light, powerful engine; large wheels with knobby tires for improved traction; and flat, wide handlebars to maximize the racer’s control in bumpy terrain...

Motorcycle Racing, speed contests on motorcycles. Motorcycle racing has many different forms: road racing over open roads; circuit racing over specially built tracks; speedway racing over oval-shaped dirt tracks; motocross racing over natural terrain, incorporating hill climbs; and race trials, also over natural terrain, but with the addition of artificial hazards...

Street motorcycles are intended primarily for everyday riding. They have all the required safety equipment for use on public highways, such as lights, mirrors, a horn, and a muffler. Their tires have a tread pattern that provides good traction on both dry and wet surfaces...